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I was looking at the profile for a multi sniper rifle and its burst is written as 2/1, I understand what happens when you use a special ammunition the rifles burst is reduced to 2.

But what does the 1 mean?

B1 is for integrated ammo - DA and AP simultaneously.

 Dheneb wrote:
B1 is for integrated ammo - DA and AP simultaneously.

I thought that was for heavy multi?

No, heavies get AP + EXP. Here's the wiki page on Multi ammo: http://infinitythegame.wikispot.org/Combi_and_Multi_Weaponry?action=show&redirect=MULTI